CARBON
| Date | Clue |
|---|---|
| 2026-08-05 | With 34-Across, sequestration of a greenhouse gas |
| 2025-03-06 | Graphite, essentially |
| 2025-03-06 | Exact replica |
| 2011-04-19 | Diamond, essentially |
| 2006-12-06 | Coal, essentially |
| 2004-08-31 | Graphite element |
| 2002-11-12 | It can help you get a date |
| 1997-08-21 | Kind of copy |